That's quite a bit of rhetoric on your part. If the article on Ars is to be believed, it's clear that the most popular downloads on Megaupload were of copyrighted material, and the site owners knew it

Ok, lets be clear on this. If that's the reason for the shutdown, all other file sharing sites similar to megaupload will go down. That includes fileshare, hotfile, oron, filesonic, rapidshare and many many more.

Personaly, loosing MU was very sad, because comparing with all the other similar sites, this one gave the anonymous users the faster download speeds.

Ok, lets be clear on this. If that's the reason for the shutdown, all other file sharing sites similar to megaupload will go down.

Not necessarily. If they're vigilant about taking down copyrighted material and keeping it down instead of actually helping users find it, they'll probably be just fine. For example, if you see that the top downloads on your site are pirated movies and such, you definitely want to remove that ASAP.

With MU, it seems that the owners knew that people were coming for the warez, and just didn't give a damn.